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Do section relocation in architecture backend

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This commit is contained in:
Thomas Preud'homme 2016-11-12 23:16:06 +08:00
parent 60374d01ae
commit cb273fdad8
9 changed files with 552 additions and 490 deletions
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16
Makefile
View file

@ -80,14 +80,14 @@ C67_CROSS = c67-tcc$(EXESUF)
CORE_FILES = tcc.c libtcc.c tccpp.c tccgen.c tccelf.c tccasm.c tccrun.c CORE_FILES = tcc.c libtcc.c tccpp.c tccgen.c tccelf.c tccasm.c tccrun.c
CORE_FILES += tcc.h config.h libtcc.h tcctok.h CORE_FILES += tcc.h config.h libtcc.h tcctok.h
I386_FILES = $(CORE_FILES) i386-gen.c i386-asm.c i386-asm.h i386-tok.h I386_FILES = $(CORE_FILES) i386-gen.c i386-link.c i386-asm.c i386-asm.h i386-tok.h
WIN32_FILES = $(CORE_FILES) i386-gen.c i386-asm.c i386-asm.h i386-tok.h tccpe.c WIN32_FILES = $(CORE_FILES) i386-gen.c i386-link.c i386-asm.c i386-asm.h i386-tok.h tccpe.c
WIN64_FILES = $(CORE_FILES) x86_64-gen.c i386-asm.c x86_64-asm.h tccpe.c WIN64_FILES = $(CORE_FILES) x86_64-gen.c x86_64-link.c i386-asm.c x86_64-asm.h tccpe.c
WINCE_FILES = $(CORE_FILES) arm-gen.c tccpe.c WINCE_FILES = $(CORE_FILES) arm-gen.c arm-link.c tccpe.c
X86_64_FILES = $(CORE_FILES) x86_64-gen.c i386-asm.c x86_64-asm.h X86_64_FILES = $(CORE_FILES) x86_64-gen.c x86_64-link.c i386-asm.c x86_64-asm.h
ARM_FILES = $(CORE_FILES) arm-gen.c ARM_FILES = $(CORE_FILES) arm-gen.c arm-link.c
ARM64_FILES = $(CORE_FILES) arm64-gen.c ARM64_FILES = $(CORE_FILES) arm64-gen.c arm64-link.c
C67_FILES = $(CORE_FILES) c67-gen.c tcccoff.c C67_FILES = $(CORE_FILES) c67-gen.c c67-link.c tcccoff.c
ifdef CONFIG_WIN32 ifdef CONFIG_WIN32
PROGS+=tiny_impdef$(EXESUF) tiny_libmaker$(EXESUF) $(LIBTCC) PROGS+=tiny_impdef$(EXESUF) tiny_libmaker$(EXESUF) $(LIBTCC)

204
arm-link.c Normal file
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@ -0,0 +1,204 @@
#include "tcc.h"
#define HAVE_SECTION_RELOC
void relocate_init(Section *sr) {}
void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
{
ElfW(Sym) *sym;
int sym_index;
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
switch(type) {
case R_ARM_PC24:
case R_ARM_CALL:
case R_ARM_JUMP24:
case R_ARM_PLT32:
{
int x, is_thumb, is_call, h, blx_avail, is_bl, th_ko;
x = (*(int *) ptr) & 0xffffff;
if (sym->st_shndx == SHN_UNDEF ||
s1->output_type == TCC_OUTPUT_MEMORY)
val = s1->plt->sh_addr;
#ifdef DEBUG_RELOC
printf ("reloc %d: x=0x%x val=0x%x ", type, x, val);
#endif
(*(int *)ptr) &= 0xff000000;
if (x & 0x800000)
x -= 0x1000000;
x <<= 2;
blx_avail = (TCC_ARM_VERSION >= 5);
is_thumb = val & 1;
is_bl = (*(unsigned *) ptr) >> 24 == 0xeb;
is_call = (type == R_ARM_CALL || (type == R_ARM_PC24 && is_bl));
x += val - addr;
#ifdef DEBUG_RELOC
printf (" newx=0x%x name=%s\n", x,
(char *) symtab_section->link->data + sym->st_name);
#endif
h = x & 2;
th_ko = (x & 3) && (!blx_avail || !is_call);
if (th_ko || x >= 0x2000000 || x < -0x2000000)
tcc_error("can't relocate value at %x,%d",addr, type);
x >>= 2;
x &= 0xffffff;
/* Only reached if blx is avail and it is a call */
if (is_thumb) {
x |= h << 24;
(*(int *)ptr) = 0xfa << 24; /* bl -> blx */
}
(*(int *) ptr) |= x;
}
return;
/* Since these relocations only concern Thumb-2 and blx instruction was
introduced before Thumb-2, we can assume blx is available and not
guard its use */
case R_ARM_THM_PC22:
case R_ARM_THM_JUMP24:
{
int x, hi, lo, s, j1, j2, i1, i2, imm10, imm11;
int to_thumb, is_call, to_plt, blx_bit = 1 << 12;
Section *plt;
/* weak reference */
if (sym->st_shndx == SHN_UNDEF &&
ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
return;
/* Get initial offset */
hi = (*(uint16_t *)ptr);
lo = (*(uint16_t *)(ptr+2));
s = (hi >> 10) & 1;
j1 = (lo >> 13) & 1;
j2 = (lo >> 11) & 1;
i1 = (j1 ^ s) ^ 1;
i2 = (j2 ^ s) ^ 1;
imm10 = hi & 0x3ff;
imm11 = lo & 0x7ff;
x = (s << 24) | (i1 << 23) | (i2 << 22) |
(imm10 << 12) | (imm11 << 1);
if (x & 0x01000000)
x -= 0x02000000;
/* Relocation infos */
to_thumb = val & 1;
plt = s1->plt;
to_plt = (val >= plt->sh_addr) &&
(val < plt->sh_addr + plt->data_offset);
is_call = (type == R_ARM_THM_PC22);
/* Compute final offset */
if (to_plt && !is_call) /* Point to 1st instr of Thumb stub */
x -= 4;
x += val - addr;
if (!to_thumb && is_call) {
blx_bit = 0; /* bl -> blx */
x = (x + 3) & -4; /* Compute offset from aligned PC */
}
/* Check that relocation is possible
* offset must not be out of range
* if target is to be entered in arm mode:
- bit 1 must not set
- instruction must be a call (bl) or a jump to PLT */
if (!to_thumb || x >= 0x1000000 || x < -0x1000000)
if (to_thumb || (val & 2) || (!is_call && !to_plt))
tcc_error("can't relocate value at %x,%d",addr, type);
/* Compute and store final offset */
s = (x >> 24) & 1;
i1 = (x >> 23) & 1;
i2 = (x >> 22) & 1;
j1 = s ^ (i1 ^ 1);
j2 = s ^ (i2 ^ 1);
imm10 = (x >> 12) & 0x3ff;
imm11 = (x >> 1) & 0x7ff;
(*(uint16_t *)ptr) = (uint16_t) ((hi & 0xf800) |
(s << 10) | imm10);
(*(uint16_t *)(ptr+2)) = (uint16_t) ((lo & 0xc000) |
(j1 << 13) | blx_bit | (j2 << 11) |
imm11);
}
return;
case R_ARM_MOVT_ABS:
case R_ARM_MOVW_ABS_NC:
{
int x, imm4, imm12;
if (type == R_ARM_MOVT_ABS)
val >>= 16;
imm12 = val & 0xfff;
imm4 = (val >> 12) & 0xf;
x = (imm4 << 16) | imm12;
if (type == R_ARM_THM_MOVT_ABS)
*(int *)ptr |= x;
else
*(int *)ptr += x;
}
return;
case R_ARM_THM_MOVT_ABS:
case R_ARM_THM_MOVW_ABS_NC:
{
int x, i, imm4, imm3, imm8;
if (type == R_ARM_THM_MOVT_ABS)
val >>= 16;
imm8 = val & 0xff;
imm3 = (val >> 8) & 0x7;
i = (val >> 11) & 1;
imm4 = (val >> 12) & 0xf;
x = (imm3 << 28) | (imm8 << 16) | (i << 10) | imm4;
if (type == R_ARM_THM_MOVT_ABS)
*(int *)ptr |= x;
else
*(int *)ptr += x;
}
return;
case R_ARM_PREL31:
{
int x;
x = (*(int *)ptr) & 0x7fffffff;
(*(int *)ptr) &= 0x80000000;
x = (x * 2) / 2;
x += val - addr;
if((x^(x>>1))&0x40000000)
tcc_error("can't relocate value at %x,%d",addr, type);
(*(int *)ptr) |= x & 0x7fffffff;
}
case R_ARM_ABS32:
*(int *)ptr += val;
return;
case R_ARM_REL32:
*(int *)ptr += val - addr;
return;
case R_ARM_GOTPC:
*(int *)ptr += s1->got->sh_addr - addr;
return;
case R_ARM_GOTOFF:
*(int *)ptr += val - s1->got->sh_addr;
return;
case R_ARM_GOT32:
/* we load the got offset */
*(int *)ptr += s1->sym_attrs[sym_index].got_offset;
return;
case R_ARM_COPY:
return;
case R_ARM_V4BX:
/* trade Thumb support for ARMv4 support */
if ((0x0ffffff0 & *(int*)ptr) == 0x012FFF10)
*(int*)ptr ^= 0xE12FFF10 ^ 0xE1A0F000; /* BX Rm -> MOV PC, Rm */
return;
case R_ARM_GLOB_DAT:
case R_ARM_JUMP_SLOT:
*(addr_t *)ptr = val;
return;
case R_ARM_NONE:
/* Nothing to do. Normally used to indicate a dependency
on a certain symbol (like for exception handling under EABI). */
return;
default:
fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
return;
}
}

104
arm64-link.c Normal file
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@ -0,0 +1,104 @@
#include "tcc.h"
#define HAVE_SECTION_RELOC
void relocate_init(Section *sr) {}
void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
{
ElfW(Sym) *sym;
int sym_index;
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
switch(type) {
case R_AARCH64_ABS64:
write64le(ptr, val);
return;
case R_AARCH64_ABS32:
write32le(ptr, val);
return;
case R_AARCH64_MOVW_UABS_G0_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val & 0xffff) << 5));
return;
case R_AARCH64_MOVW_UABS_G1_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 16 & 0xffff) << 5));
return;
case R_AARCH64_MOVW_UABS_G2_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 32 & 0xffff) << 5));
return;
case R_AARCH64_MOVW_UABS_G3:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 48 & 0xffff) << 5));
return;
case R_AARCH64_ADR_PREL_PG_HI21: {
uint64_t off = (val >> 12) - (addr >> 12);
if ((off + ((uint64_t)1 << 20)) >> 21)
tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
(off & 0x1ffffc) << 3 | (off & 3) << 29));
return;
}
case R_AARCH64_ADD_ABS_LO12_NC:
write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
(val & 0xfff) << 10));
return;
case R_AARCH64_JUMP26:
case R_AARCH64_CALL26:
/* This check must match the one in build_got_entries, testing
if we really need a PLT slot. */
if (sym->st_shndx == SHN_UNDEF ||
s1->output_type == TCC_OUTPUT_MEMORY)
/* We've put the PLT slot offset into r_addend when generating
it, and that's what we must use as relocation value (adjusted
by section offset of course). */
val = s1->plt->sh_addr + rel->r_addend;
#ifdef DEBUG_RELOC
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
(char *) symtab_section->link->data + sym->st_name);
#endif
if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
{
tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed (val=%lx, addr=%lx)", addr, val);
}
write32le(ptr, (0x14000000 |
(uint32_t)(type == R_AARCH64_CALL26) << 31 |
((val - addr) >> 2 & 0x3ffffff)));
return;
case R_AARCH64_ADR_GOT_PAGE: {
uint64_t off =
(((s1->got->sh_addr +
s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
if ((off + ((uint64_t)1 << 20)) >> 21)
tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
(off & 0x1ffffc) << 3 | (off & 3) << 29));
return;
}
case R_AARCH64_LD64_GOT_LO12_NC:
write32le(ptr,
((read32le(ptr) & 0xfff803ff) |
((s1->got->sh_addr +
s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
return;
case R_AARCH64_COPY:
return;
case R_AARCH64_GLOB_DAT:
case R_AARCH64_JUMP_SLOT:
/* They don't need addend */
#ifdef DEBUG_RELOC
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
val - rel->r_addend,
(char *) symtab_section->link->data + sym->st_name);
#endif
write64le(ptr, val - rel->r_addend);
return;
default:
fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
return;
}
}

35
c67-link.c Normal file
View file

@ -0,0 +1,35 @@
#include "tcc.h"
#define HAVE_SECTION_RELOC
void relocate_init(Section *sr) {}
void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
{
switch(type) {
case R_C60_32:
*(int *)ptr += val;
break;
case R_C60LO16:
{
uint32_t orig;
/* put the low 16 bits of the absolute address add to what is
already there */
orig = ((*(int *)(ptr )) >> 7) & 0xffff;
orig |= (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16;
/* patch both at once - assumes always in pairs Low - High */
*(int *) ptr = (*(int *) ptr & (~(0xffff << 7)) ) |
(((val+orig) & 0xffff) << 7);
*(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) |
((((val+orig)>>16) & 0xffff) << 7);
}
break;
case R_C60HI16:
break;
default:
fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned) addr, ptr, (unsigned) val);
break;
}
}

90
i386-link.c Normal file
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@ -0,0 +1,90 @@
#include "tcc.h"
#define HAVE_SECTION_RELOC
static ElfW_Rel *qrel; /* ptr to next reloc entry reused */
void relocate_init(Section *sr)
{
qrel = (ElfW_Rel *) sr->data;
}
void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
{
int sym_index, esym_index;
sym_index = ELFW(R_SYM)(rel->r_info);
switch (type) {
case R_386_32:
if (s1->output_type == TCC_OUTPUT_DLL) {
esym_index = s1->symtab_to_dynsym[sym_index];
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32);
qrel++;
return;
} else {
qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE);
qrel++;
}
}
add32le(ptr, val);
return;
case R_386_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32);
qrel++;
return;
}
}
add32le(ptr, val - addr);
return;
case R_386_PLT32:
add32le(ptr, val - addr);
return;
case R_386_GLOB_DAT:
case R_386_JMP_SLOT:
write32le(ptr, val);
return;
case R_386_GOTPC:
add32le(ptr, s1->got->sh_addr - addr);
return;
case R_386_GOTOFF:
add32le(ptr, val - s1->got->sh_addr);
return;
case R_386_GOT32:
case R_386_GOT32X:
/* we load the got offset */
add32le(ptr, s1->sym_attrs[sym_index].got_offset);
return;
case R_386_16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY) {
output_file:
tcc_error("can only produce 16-bit binary files");
}
write16le(ptr, read16le(ptr) + val);
return;
case R_386_PC16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY)
goto output_file;
write16le(ptr, read16le(ptr) + val - addr);
return;
case R_386_RELATIVE:
/* do nothing */
return;
case R_386_COPY:
/* This reloction must copy initialized data from the library
to the program .bss segment. Currently made like for ARM
(to remove noise of defaukt case). Is this true?
*/
return;
default:
fprintf(stderr,"FIXME: handle reloc type %d at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
return;
}
}

5
libtcc.c
View file

@ -41,18 +41,23 @@ ST_DATA struct TCCState *tcc_state;
#include "tccrun.c" #include "tccrun.c"
#ifdef TCC_TARGET_I386 #ifdef TCC_TARGET_I386
#include "i386-gen.c" #include "i386-gen.c"
#include "i386-link.c"
#endif #endif
#ifdef TCC_TARGET_ARM #ifdef TCC_TARGET_ARM
#include "arm-gen.c" #include "arm-gen.c"
#include "arm-link.c"
#endif #endif
#ifdef TCC_TARGET_ARM64 #ifdef TCC_TARGET_ARM64
#include "arm64-gen.c" #include "arm64-gen.c"
#include "arm64-link.c"
#endif #endif
#ifdef TCC_TARGET_C67 #ifdef TCC_TARGET_C67
#include "c67-gen.c" #include "c67-gen.c"
#include "c67-link.c"
#endif #endif
#ifdef TCC_TARGET_X86_64 #ifdef TCC_TARGET_X86_64
#include "x86_64-gen.c" #include "x86_64-gen.c"
#include "x86_64-link.c"
#endif #endif
#ifdef CONFIG_TCC_ASM #ifdef CONFIG_TCC_ASM
#include "tccasm.c" #include "tccasm.c"

5
tcc.h
View file

@ -1485,6 +1485,11 @@ ST_FUNC void gen_clear_cache(void);
#ifdef TCC_TARGET_C67 #ifdef TCC_TARGET_C67
#endif #endif
/* ------------ xxx-link.c ------------ */
ST_FUNC void relocate_init(Section *sr);
ST_FUNC void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val);
/* ------------ tcccoff.c ------------ */ /* ------------ tcccoff.c ------------ */
#ifdef TCC_TARGET_COFF #ifdef TCC_TARGET_COFF

484
tccelf.c
View file

@ -694,11 +694,8 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
int type, sym_index; int type, sym_index;
unsigned char *ptr; unsigned char *ptr;
addr_t val, addr; addr_t val, addr;
#if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
ElfW_Rel *qrel = (ElfW_Rel *) sr->data; /* ptr to next reloc entry reused */
int esym_index;
#endif
relocate_init(sr);
for_each_elem(sr, 0, rel, ElfW_Rel) { for_each_elem(sr, 0, rel, ElfW_Rel) {
ptr = s->data + rel->r_offset; ptr = s->data + rel->r_offset;
@ -711,484 +708,7 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
type = ELFW(R_TYPE)(rel->r_info); type = ELFW(R_TYPE)(rel->r_info);
addr = s->sh_addr + rel->r_offset; addr = s->sh_addr + rel->r_offset;
/* CPU specific */ relocate(s1, rel, type, ptr, addr, val);
switch(type) {
#if defined(TCC_TARGET_I386)
case R_386_32:
if (s1->output_type == TCC_OUTPUT_DLL) {
esym_index = s1->symtab_to_dynsym[sym_index];
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32);
qrel++;
break;
} else {
qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE);
qrel++;
}
}
add32le(ptr, val);
break;
case R_386_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32);
qrel++;
break;
}
}
add32le(ptr, val - addr);
break;
case R_386_PLT32:
add32le(ptr, val - addr);
break;
case R_386_GLOB_DAT:
case R_386_JMP_SLOT:
write32le(ptr, val);
break;
case R_386_GOTPC:
add32le(ptr, s1->got->sh_addr - addr);
break;
case R_386_GOTOFF:
add32le(ptr, val - s1->got->sh_addr);
break;
case R_386_GOT32:
case R_386_GOT32X:
/* we load the got offset */
add32le(ptr, s1->sym_attrs[sym_index].got_offset);
break;
case R_386_16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY) {
output_file:
tcc_error("can only produce 16-bit binary files");
}
write16le(ptr, read16le(ptr) + val);
break;
case R_386_PC16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY)
goto output_file;
write16le(ptr, read16le(ptr) + val - addr);
break;
#ifdef TCC_TARGET_PE
case R_386_RELATIVE: /* handled in pe_relocate_rva() */
break;
#endif
case R_386_COPY:
/* This reloction must copy initialized data from the library
to the program .bss segment. Currently made like for ARM
(to remove noise of defaukt case). Is this true?
*/
break;
default:
fprintf(stderr,"FIXME: handle reloc type %d at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_ARM)
case R_ARM_PC24:
case R_ARM_CALL:
case R_ARM_JUMP24:
case R_ARM_PLT32:
{
int x, is_thumb, is_call, h, blx_avail, is_bl, th_ko;
x = (*(int *) ptr) & 0xffffff;
if (sym->st_shndx == SHN_UNDEF
|| s1->output_type == TCC_OUTPUT_MEMORY)
val = s1->plt->sh_addr;
#ifdef DEBUG_RELOC
printf ("reloc %d: x=0x%x val=0x%x ", type, x, val);
#endif
(*(int *)ptr) &= 0xff000000;
if (x & 0x800000)
x -= 0x1000000;
x <<= 2;
blx_avail = (TCC_ARM_VERSION >= 5);
is_thumb = val & 1;
is_bl = (*(unsigned *) ptr) >> 24 == 0xeb;
is_call = (type == R_ARM_CALL || (type == R_ARM_PC24 && is_bl));
x += val - addr;
#ifdef DEBUG_RELOC
printf (" newx=0x%x name=%s\n", x,
(char *) symtab_section->link->data + sym->st_name);
#endif
h = x & 2;
th_ko = (x & 3) && (!blx_avail || !is_call);
if (th_ko || x >= 0x2000000 || x < -0x2000000)
tcc_error("can't relocate value at %x,%d",addr, type);
x >>= 2;
x &= 0xffffff;
/* Only reached if blx is avail and it is a call */
if (is_thumb) {
x |= h << 24;
(*(int *)ptr) = 0xfa << 24; /* bl -> blx */
}
(*(int *) ptr) |= x;
}
break;
/* Since these relocations only concern Thumb-2 and blx instruction was
introduced before Thumb-2, we can assume blx is available and not
guard its use */
case R_ARM_THM_PC22:
case R_ARM_THM_JUMP24:
{
int x, hi, lo, s, j1, j2, i1, i2, imm10, imm11;
int to_thumb, is_call, to_plt, blx_bit = 1 << 12;
Section *plt;
/* weak reference */
if (sym->st_shndx == SHN_UNDEF &&
ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
break;
/* Get initial offset */
hi = (*(uint16_t *)ptr);
lo = (*(uint16_t *)(ptr+2));
s = (hi >> 10) & 1;
j1 = (lo >> 13) & 1;
j2 = (lo >> 11) & 1;
i1 = (j1 ^ s) ^ 1;
i2 = (j2 ^ s) ^ 1;
imm10 = hi & 0x3ff;
imm11 = lo & 0x7ff;
x = (s << 24) | (i1 << 23) | (i2 << 22) |
(imm10 << 12) | (imm11 << 1);
if (x & 0x01000000)
x -= 0x02000000;
/* Relocation infos */
to_thumb = val & 1;
plt = s1->plt;
to_plt = (val >= plt->sh_addr) &&
(val < plt->sh_addr + plt->data_offset);
is_call = (type == R_ARM_THM_PC22);
/* Compute final offset */
if (to_plt && !is_call) /* Point to 1st instr of Thumb stub */
x -= 4;
x += val - addr;
if (!to_thumb && is_call) {
blx_bit = 0; /* bl -> blx */
x = (x + 3) & -4; /* Compute offset from aligned PC */
}
/* Check that relocation is possible
* offset must not be out of range
* if target is to be entered in arm mode:
- bit 1 must not set
- instruction must be a call (bl) or a jump to PLT */
if (!to_thumb || x >= 0x1000000 || x < -0x1000000)
if (to_thumb || (val & 2) || (!is_call && !to_plt))
tcc_error("can't relocate value at %x,%d",addr, type);
/* Compute and store final offset */
s = (x >> 24) & 1;
i1 = (x >> 23) & 1;
i2 = (x >> 22) & 1;
j1 = s ^ (i1 ^ 1);
j2 = s ^ (i2 ^ 1);
imm10 = (x >> 12) & 0x3ff;
imm11 = (x >> 1) & 0x7ff;
(*(uint16_t *)ptr) = (uint16_t) ((hi & 0xf800) |
(s << 10) | imm10);
(*(uint16_t *)(ptr+2)) = (uint16_t) ((lo & 0xc000) |
(j1 << 13) | blx_bit | (j2 << 11) |
imm11);
}
break;
case R_ARM_MOVT_ABS:
case R_ARM_MOVW_ABS_NC:
{
int x, imm4, imm12;
if (type == R_ARM_MOVT_ABS)
val >>= 16;
imm12 = val & 0xfff;
imm4 = (val >> 12) & 0xf;
x = (imm4 << 16) | imm12;
if (type == R_ARM_THM_MOVT_ABS)
*(int *)ptr |= x;
else
*(int *)ptr += x;
}
break;
case R_ARM_THM_MOVT_ABS:
case R_ARM_THM_MOVW_ABS_NC:
{
int x, i, imm4, imm3, imm8;
if (type == R_ARM_THM_MOVT_ABS)
val >>= 16;
imm8 = val & 0xff;
imm3 = (val >> 8) & 0x7;
i = (val >> 11) & 1;
imm4 = (val >> 12) & 0xf;
x = (imm3 << 28) | (imm8 << 16) | (i << 10) | imm4;
if (type == R_ARM_THM_MOVT_ABS)
*(int *)ptr |= x;
else
*(int *)ptr += x;
}
break;
case R_ARM_PREL31:
{
int x;
x = (*(int *)ptr) & 0x7fffffff;
(*(int *)ptr) &= 0x80000000;
x = (x * 2) / 2;
x += val - addr;
if((x^(x>>1))&0x40000000)
tcc_error("can't relocate value at %x,%d",addr, type);
(*(int *)ptr) |= x & 0x7fffffff;
}
case R_ARM_ABS32:
*(int *)ptr += val;
break;
case R_ARM_REL32:
*(int *)ptr += val - addr;
break;
case R_ARM_GOTPC:
*(int *)ptr += s1->got->sh_addr - addr;
break;
case R_ARM_GOTOFF:
*(int *)ptr += val - s1->got->sh_addr;
break;
case R_ARM_GOT32:
/* we load the got offset */
*(int *)ptr += s1->sym_attrs[sym_index].got_offset;
break;
case R_ARM_COPY:
break;
case R_ARM_V4BX:
/* trade Thumb support for ARMv4 support */
if ((0x0ffffff0 & *(int*)ptr) == 0x012FFF10)
*(int*)ptr ^= 0xE12FFF10 ^ 0xE1A0F000; /* BX Rm -> MOV PC, Rm */
break;
case R_ARM_GLOB_DAT:
case R_ARM_JUMP_SLOT:
*(addr_t *)ptr = val;
break;
case R_ARM_NONE:
/* Nothing to do. Normally used to indicate a dependency
on a certain symbol (like for exception handling under EABI). */
break;
#ifdef TCC_TARGET_PE
case R_ARM_RELATIVE: /* handled in pe_relocate_rva() */
break;
#endif
default:
fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_ARM64)
case R_AARCH64_ABS64:
write64le(ptr, val);
break;
case R_AARCH64_ABS32:
write32le(ptr, val);
break;
case R_AARCH64_PREL32:
write32le(ptr, val - addr);
break;
case R_AARCH64_MOVW_UABS_G0_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val & 0xffff) << 5));
break;
case R_AARCH64_MOVW_UABS_G1_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 16 & 0xffff) << 5));
break;
case R_AARCH64_MOVW_UABS_G2_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 32 & 0xffff) << 5));
break;
case R_AARCH64_MOVW_UABS_G3:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 48 & 0xffff) << 5));
break;
case R_AARCH64_ADR_PREL_PG_HI21: {
uint64_t off = (val >> 12) - (addr >> 12);
if ((off + ((uint64_t)1 << 20)) >> 21)
tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
(off & 0x1ffffc) << 3 | (off & 3) << 29));
break;
}
case R_AARCH64_ADD_ABS_LO12_NC:
write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
(val & 0xfff) << 10));
break;
case R_AARCH64_JUMP26:
case R_AARCH64_CALL26:
/* This check must match the one in build_got_entries, testing
if we really need a PLT slot. */
if (sym->st_shndx == SHN_UNDEF ||
s1->output_type == TCC_OUTPUT_MEMORY)
/* We've put the PLT slot offset into r_addend when generating
it, and that's what we must use as relocation value (adjusted
by section offset of course). */
val = s1->plt->sh_addr + rel->r_addend;
#ifdef DEBUG_RELOC
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
(char *) symtab_section->link->data + sym->st_name);
#endif
if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
{
tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed (val=%lx, addr=%lx)", addr, val);
}
write32le(ptr, (0x14000000 |
(uint32_t)(type == R_AARCH64_CALL26) << 31 |
((val - addr) >> 2 & 0x3ffffff)));
break;
case R_AARCH64_ADR_GOT_PAGE: {
uint64_t off =
(((s1->got->sh_addr +
s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
if ((off + ((uint64_t)1 << 20)) >> 21)
tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
(off & 0x1ffffc) << 3 | (off & 3) << 29));
break;
}
case R_AARCH64_LD64_GOT_LO12_NC:
write32le(ptr,
((read32le(ptr) & 0xfff803ff) |
((s1->got->sh_addr +
s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
break;
case R_AARCH64_COPY:
break;
case R_AARCH64_GLOB_DAT:
case R_AARCH64_JUMP_SLOT:
/* They don't need addend */
#ifdef DEBUG_RELOC
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
val - rel->r_addend,
(char *) symtab_section->link->data + sym->st_name);
#endif
write64le(ptr, val - rel->r_addend);
break;
default:
fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_C67)
case R_C60_32:
*(int *)ptr += val;
break;
case R_C60LO16:
{
uint32_t orig;
/* put the low 16 bits of the absolute address
add to what is already there */
orig = ((*(int *)(ptr )) >> 7) & 0xffff;
orig |= (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16;
/* patch both at once - assumes always in pairs Low - High */
*(int *) ptr = (*(int *) ptr & (~(0xffff << 7)) ) | (((val+orig) & 0xffff) << 7);
*(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) | ((((val+orig)>>16) & 0xffff) << 7);
}
break;
case R_C60HI16:
break;
default:
fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_X86_64)
case R_X86_64_64:
if (s1->output_type == TCC_OUTPUT_DLL) {
esym_index = s1->symtab_to_dynsym[sym_index];
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64);
qrel->r_addend = rel->r_addend;
qrel++;
break;
} else {
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
qrel->r_addend = read64le(ptr) + val;
qrel++;
}
}
add64le(ptr, val);
break;
case R_X86_64_32:
case R_X86_64_32S:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* XXX: this logic may depend on TCC's codegen
now TCC uses R_X86_64_32 even for a 64bit pointer */
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr) + val;
qrel++;
}
add32le(ptr, val);
break;
case R_X86_64_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr) + rel->r_addend;
qrel++;
break;
}
}
goto plt32pc32;
case R_X86_64_PLT32:
/* We've put the PLT slot offset into r_addend when generating
it, and that's what we must use as relocation value (adjusted
by section offset of course). */
val = s1->plt->sh_addr + rel->r_addend;
/* fallthrough. */
plt32pc32:
{
long long diff;
diff = (long long)val - addr;
if (diff < -2147483648LL || diff > 2147483647LL) {
tcc_error("internal error: relocation failed");
}
add32le(ptr, diff);
}
break;
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
/* They don't need addend */
write64le(ptr, val - rel->r_addend);
break;
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
add32le(ptr, s1->got->sh_addr - addr
+ s1->sym_attrs[sym_index].got_offset - 4);
break;
case R_X86_64_GOTTPOFF:
add32le(ptr, val - s1->got->sh_addr);
break;
case R_X86_64_GOT32:
/* we load the got offset */
add32le(ptr, s1->sym_attrs[sym_index].got_offset);
break;
#ifdef TCC_TARGET_PE
case R_X86_64_RELATIVE: /* handled in pe_relocate_rva() */
break;
#endif
#else
#error unsupported processor
#endif
}
} }
/* if the relocation is allocated, we change its symbol table */ /* if the relocation is allocated, we change its symbol table */
if (sr->sh_flags & SHF_ALLOC) if (sr->sh_flags & SHF_ALLOC)

99
x86_64-link.c Normal file
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@ -0,0 +1,99 @@
#include "tcc.h"
#define HAVE_SECTION_RELOC
static ElfW_Rel *qrel; /* ptr to next reloc entry reused */
void relocate_init(Section *sr)
{
qrel = (ElfW_Rel *) sr->data;
}
void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
{
int sym_index, esym_index;
sym_index = ELFW(R_SYM)(rel->r_info);
switch (type) {
case R_X86_64_64:
if (s1->output_type == TCC_OUTPUT_DLL) {
esym_index = s1->symtab_to_dynsym[sym_index];
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64);
qrel->r_addend = rel->r_addend;
qrel++;
break;
} else {
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
qrel->r_addend = read64le(ptr) + val;
qrel++;
}
}
add64le(ptr, val);
break;
case R_X86_64_32:
case R_X86_64_32S:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* XXX: this logic may depend on TCC's codegen
now TCC uses R_X86_64_32 even for a 64bit pointer */
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr) + val;
qrel++;
}
add32le(ptr, val);
break;
case R_X86_64_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr) + rel->r_addend;
qrel++;
break;
}
}
goto plt32pc32;
case R_X86_64_PLT32:
/* We've put the PLT slot offset into r_addend when generating
it, and that's what we must use as relocation value (adjusted
by section offset of course). */
val = s1->plt->sh_addr + rel->r_addend;
/* fallthrough. */
plt32pc32:
{
long long diff;
diff = (long long)val - addr;
if (diff < -2147483648LL || diff > 2147483647LL) {
tcc_error("internal error: relocation failed");
}
add32le(ptr, diff);
}
break;
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
/* They don't need addend */
write64le(ptr, val - rel->r_addend);
break;
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
add32le(ptr, s1->got->sh_addr - addr +
s1->sym_attrs[sym_index].got_offset - 4);
break;
case R_X86_64_GOTTPOFF:
add32le(ptr, val - s1->got->sh_addr);
break;
case R_X86_64_GOT32:
/* we load the got offset */
add32le(ptr, s1->sym_attrs[sym_index].got_offset);
break;
}
}